Atamanuik was born to Marlena J. Yannetti,[5][6] an actress, choreographer[7] and dancer of Italian[8] and Ashkenazi Jewish ancestry with credits including How to Succeed in Business Without Really Trying, and Lawrence Peter Atamanuik, a drummer of Ukrainian ancestry with credits including Seatrain, Alison Krauss, and Canadian band Crowbar.

He moved to Los Angeles and worked for Jim Henson Interactive, Mr. Show, and Suzanne Somers.

[13][14][15][16] He is a member of the improv team Death by Roo and as a co-host on ASSSSCAT3000 and The Tony Show With Anthony Atamanuik[17] and wrote for Time Traveling Bong.

[1] On television, he appeared in Brett Gelman's Dinner in America (2016), 30 Rock,[18][19][20] Broad City, Hulu's Difficult People, MTV's Teachers' Lounge, What We Do in the Shadows, Star Wars: Skeleton Crew, and, as himself, bartending on Watch What Happens Live.

[21] Atamanuik created and starred in The President Show,[22] which ran for one season on Comedy Central, with 20 episodes, from April to November 2017.